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Efficient dual cathode interfacial layer for high performance organic and perovskite solar cells
Aryal, Um Kanta,Arivunithi, Veera Murugan,Reddy, Saripally Sudhaker,Kim, Junyoung,Gal, Yeong-Soon,Jin, Sung-Ho Elsevier 2018 ORGANIC ELECTRONICS Vol.63 No.-
<P><B>Abstract</B></P> <P>Cathode interfacial layer (CIL), phenylquinoline-based, 10-ethyl-3,7-bis(4-phenylquinolin-2-yl)-10<I>H</I>-phenothiazine (PTDPQ) was employed between the ZnO and photoactive layer, poly[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl] thieno[3,4-<I>b</I>]-thiophenediyl] (PTB7):[6,6]-phenyl C<SUB>71</SUB>-butyric acid methyl ester (PC<SUB>71</SUB>BM) for the inverted organic solar cells (IOSCs) and between LiF and PTB7:PC<SUB>71</SUB>BM for conventional organic solar cells (COSCs). It was also incorporated as interfacial layer in perovskite solar cells (PSCs). For the ZnO/PTDPQ bilayer, the power conversion efficiency (PCE) enhanced to 8.69%, which is about 15% improvement than that of the control IOSCs reference device. For the PTDPQ/LiF bilayer, it was achieved to 8.06%, and after insertion of PTDPQ as interfacial layer for PSCs, average PCE enhanced to 16.45% from that of 15.28% reference device. Hereinafter, PTDPQ as CIL enhances the solar cells device performance. It is analyzed that the charge recombination is suppressed and facilitates charge extraction due to the incorporation of the dual CIL as accordance with observed improvement of the solar cell parameters. The devices with dual CIL showed the higher electron mobility which matches with the higher fill factor and improved current density. The dual CIL exhibited excellent impact on enhancing the photovoltaic properties of OSCs and PSCs along with long-term stability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The phenylquinoline based, PTDPQ is used as dual CIL for organic and perovskite solar cell application. </LI> <LI> Dual CIL played a great role in the improvement of overall photovoltaic performances. </LI> <LI> The solar cell devices with PTDPQ significantly enhanced both OSCs and PSCs performance. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Um Kanta Aryal,Saripally Sudhaker Reddy,최정민,우채영,장석훈,이윤구,김봉수,이형우,진성호 한국고분자학회 2020 Macromolecular Research Vol.28 No.8
Cathode interfacial layers (CIL) have been applied in organic solar cells (OSCs) for the enhancement of photovoltaic characteristics. Most of them are employed in either conventional organic solar cells (COSCs) or inverted organic solar cells (IOSCs) only. Herein, we have designed and synthesized two cathode interfacial materials, namely, 3-(4,6-bis(4-bromophenoxy)-1,3,5-triazin-2-yl)-2,6-difluorophenyl)diphenylphosphine oxide (Br-PO-TAZ) and 4,4'-((6-(3-(diphenylphosphoryl)-2,4-difluorophenyl)- 1,3,5-triazine-2,4-diyl)bis(oxy))dibenzonitrile (CN-PO-TAZ), and utilized them as CILs for both COSCs and IOSCs. The incorporation of our new CIL layers significantly enhanced the photovoltaic performance compared to COSCs and IOSCs without the CILs. The CN-PO-TAZ exhibited a power conversion efficiency (PCE) of 8.19% for COSCs and 8.33% for IOSCs, whereas Br-PO-TAZ yielded a PCE of 8.15% for COSCs and 8.23% for IOSCs, respectively. The improved performance was attributed to the multiple favorable factors: significantly reducing leakage current, decreasing series resistance, suppressing recombination, efficient charge transport and collection. Moreover, the CIL layers helped for sustaining device stability because they served as an internal shield against humidity.
Triazine-based Polyelectrolyte as an Efficient Cathode Interfacial Material for Polymer Solar Cells
Chakravarthi, Nallan,Aryal, Um Kanta,Gunasekar, Kumarasamy,Park, Ho-Yeol,Gal, Yeong-Soon,Cho, Young-Rae,Yoo, Seong Il,Song, Myungkwan,Jin, Sung-Ho American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.29
<P>A novel polyelectrolyte containing triazine (TAZ) and benzodithiophene (BDT) scaffolds with polar phosphine oxide (P=O) and quaternary ammonium ions as pendant groups, respectively, in the polymer backbone (PBTAZPOBr) was synthesized to use it as a cathode interfacial layer (CIL) for polymer solar cell (PSC) application. Owing to the high electron affinity of the TAZ unit and P=O group, PBTAZPOBr could behave as an effective electron transport material. Due to the polar quaternary ammonium and P=O groups, the interfacial dipole moment created by PBTAZPOBr substantially reduced the work function of the metal cathode to afford better energy alignment in the device, thus enabling electron extraction and reducing recombination of excitons at the photoactive layer/cathode interface. Consequently, the PSC devices based on the poly[4,8-bis(2-ethylhexyloxyl)benzo[1,2-b:4,5-b']dithiophene-2,6-diyl-alt-ethylhexyl-3-fluorothithieno[3,4-b]thiophene-2-carboxylate-4,6-diyl]:[6,6]-phenyl-C71-butyric acid methyl ester (PTB7:PC71BM) system with PBTAZPOBr as CIL displayed simultaneously enhanced open-circuit voltage, short-circuit current density, and fill factor, whereas the power conversion efficiency increased from 5.42% to 8.04% compared to that of the pristine Al device. The outstanding performance of PBTAZPOBr is attributed not only to the polar pendant groups of BDT unit but also to the TAZ unit linked with the P=O group of PBTAZPOBr, demonstrating that functionalized TAZ building blocks are very promising cathode interfacial materials (CIMs). The design strategy proposed in this work will be helpful to develop more efficient CIMs for high performance PSCs in the future.</P>
Kranthiraja, Kakaraparthi,Aryal, Um Kanta,Sree, Vijaya Gopalan,Gunasekar, Kumarasamy,Lee, Changyeon,Kim, Minseok,Kim, Bumjoon J.,Song, Myungkwan,Jin, Sung-Ho American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.16
<P>The ternary-blend approach has the potential to enhance the power conversion efficiencies (PCEs) of polymer solar cells (PSCs) by providing complementary absorption and efficient charge generation. Unfortunately, most PSCs are processed with toxic halogenated solvents, which are harmful to human health and the environment. Herein, we report the addition of a nonfullerene electron acceptor 3,9-bis(2-methylene-(3-(1,1-dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-<I>d</I>:2′,3′-<I>d</I>′]-<I>s</I>-indaceno[1,2-<I>b</I>:5,6-<I>b</I>′]dithiophene (ITIC) to a binary blend (poly[4,8-bis(2-(4-(2-ethylhexyloxy)3-fluorophenyl)-5-thienyl)benzo[1,2-<I>b</I>:4,5-<I>b</I>′]dithiophene-<I>alt</I>-1,3-bis(4-octylthien-2-yl)-5-(2-ethylhexyl)thieno[3,4-<I>c</I>]pyrrole-4,6-dione] (P1):[6,6]-phenyl-C<SUB>71</SUB>-butyric acid methyl ester (PC<SUB>71</SUB>BM), PCE = 8.07%) to produce an efficient nonhalogenated green solvent-processed ternary PSC system with a high PCE of 10.11%. The estimated wetting coefficient value (0.086) for the ternary blend suggests that ITIC could be located at the P1:PC<SUB>71</SUB>BM interface, resulting in efficient charge generation and charge transport. In addition, the improved current density, sustained open-circuit voltage and PCE of the optimized ternary PSCs were highly correlated with their better external quantum efficiency response and flat-band potential value obtained from the Mott-Schottky analysis. In addition, the ternary PSCs also showed excellent ambient stability over 720 h. Therefore, our results demonstrate the combination of fullerene and nonfullerene acceptors in ternary blend as an efficient approach to improve the performance of eco-friendly solvent-processed PSCs with long-term stability.</P> [FIG OMISSION]</BR>
A New Benzodithiophene Based Donor-Acceptor π-Conjugated Polymer for Organic Solar Cells
Saripally Sudhaker Reddy,Um Kanta Aryal,진현정,Thavamani Gokulnath,Durga Gayathri Rajalapati,Kakaraparthi Kranthiraja,신성태,진성호 한국고분자학회 2020 Macromolecular Research Vol.28 No.2
A new benzodithiophene based donor-acceptor π-conjugated polymer (P1) is designed and explored as the photoactive donor for organic solar cells (OSCs). The synthesized donor polymer, P1 displays a wide absorption profile ranging from 300-750 nm with optical band gap of 1.61 eV and moderate ionization potential of -5.30 eV. It has good solubility in non-halogenated and halogenated organic solvents. Next, we fabricated OSCs with P1 by blending with PC71BM, the pristine polymer processed from chlorobenzene showed PCE of 2.79%. Upon addition of external additive diphenyl ether to the blend showed a dramatic improvement in PCE with maximum of 5.33%. DPE tailored the active layer morphology and showed two times higher PCE than pristine films. These results clearly indicate that the new polymer has a great potentiality for enhancing efficiency upon solvent additives, which will provide new routes for the development of new class of polymers for high-performance air-stable OSCs.
Kakaraparthi Kranthiraja,김혜린,이지은,Um Kanta Aryal,Saripally Sudhaker Reddy,Rajalapati Durga Gayathri,Thavamani Gokulnath,진성호 한국고분자학회 2023 Macromolecular Research Vol.31 No.9
We report a series of π-conjugated polymers (P1-F, P2-Cl, and P3-OMe) with three different functional groups (fluorine, chlorine, and methoxy) on their conjugated side chains. Although all three polymers showed identical photophysical properties by varying the functional group, they showed a notable difference in their dipole moment difference between the ground and excited state (Δµge) values. Furthermore, photovoltaic properties of fullerene organic solar cells (FOSCs)/non-fullerene organic solar cells (NFOSCs) were significantly affected concerning the functional group in the π-conjugated polymer. Interestingly, halogen-substituted polymers (P1-F and P2-Cl) showed an enhanced PCE than methoxy-substituted polymer (P3-OMe) in both NFOSCs and FOSCs. Also, the FOSCs were much affected upon functional group modulation than did in NFOSCs. The difference in the photovoltaic properties of P1-F, P2-Cl and P3-OMe based OSCs was further analyzed by atomic force microscopy, space charge limited current method, water contact angle and transient photoluminescence measurements. Overall, our work sheds light on the importance of side chain functional group modulation of donor polymers for efficient F and NFOSCs.